45 lines
1.5 KiB
NASM
45 lines
1.5 KiB
NASM
; Copyright (C) 2025 Elaina Claus
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;
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; This program is free software: you can redistribute it and/or modify
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; it under the terms of the GNU General Public License as published by
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; the Free Software Foundation, either version 3 of the License, or
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; (at your option) any later version.
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;
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; This program is distributed in the hope that it will be useful,
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; but WITHOUT ANY WARRANTY; without even the implied warranty of
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; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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; GNU General Public License for more details.
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;
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; You should have received a copy of the GNU General Public License
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; along with this program. If not, see <https://www.gnu.org/licenses/>.
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%ifndef __INC_ERROR_FUNC
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%macro ERROR 1
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%ifdef __STEVIA_DEV_DEBUG
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__BOCHS_MAGIC_DEBUG
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%endif
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mov al, %1 ; al = 1 byte error code mapped to ascii values
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jmp error
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%endmacro
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; pass error as ascii character in al, errors a-zA-Z or 0-9
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ALIGN 4, db 0x90
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error:
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cmp al, STEVIA_DEBUG_OK
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jge short .debug ; the 'letter >= W' (W, X, Y, Z) are used as special debug codes
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mov ah, 0x4F ; color 0x4F is white text/red background
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jmp short .print
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.debug:
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mov ah, 0x5F ; debug case is white text/purple background
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.print:
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mov dx, 0xB800
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mov gs, dx
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mov word [gs:0x0000], ax ; 0xB8000 = video memory
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.halt:
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cli
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hlt
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jmp short .halt
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%endif
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%define __INC_ERROR_FUNC |